void
FltExportVisitor::writeLightSource(const osg::LightSource &node)
{
static const unsigned int ENABLED = 0x80000000u >> 0;
static const unsigned int GLOBAL = 0x80000000u >> 1;
osg::Light const *light = node.getLight();
int index = _lightSourcePalette->add(light);
osg::Vec4d const &lightPos = light->getPosition();
osg::Vec3f const &lightDir = light->getDirection();
uint32 flags = 0;
osg::StateSet const *ss = getCurrentStateSet();
if (ss->getMode(GL_LIGHT0 + light->getLightNum()) & osg::StateAttribute::ON)
{
flags |= ENABLED;
}
// If this light is enabled for the node at the top of our StateSet stack,
// assume it is 'global' for OpenFlight's purposes
ss = _stateSetStack.front().get();
if (ss->getMode(GL_LIGHT0 + light->getLightNum()) & osg::StateAttribute::ON)
{
flags |= GLOBAL;
}
uint16 length(64);
IdHelper id(*this, node.getName());
_records->writeInt16((int16) LIGHT_SOURCE_OP);
_records->writeInt16(length);
_records->writeID(id);
_records->writeInt32(0); // Reserved
_records->writeInt32(index); // Index into light source palette
_records->writeInt32(0); // Reserved
_records->writeUInt32(flags); // Flags
_records->writeInt32(0); // Reserved
_records->writeVec3d(osg::Vec3d(
lightPos.x(), lightPos.y(), lightPos.z()));
// TODO: Verify that indices 0 and 1 correspond to yaw and pitch
_records->writeFloat32(lightDir[0]); // Yaw
_records->writeFloat32(lightDir[1]); // Pitch
}
void daeWriter::apply( osg::LightSource &node )
{
debugPrint( node );
updateCurrentDaeNode();
domInstance_light *il = daeSafeCast< domInstance_light >( currentNode->add( COLLADA_ELEMENT_INSTANCE_LIGHT ) );
std::string name = node.getName();
if ( name.empty() )
{
name = uniquify( "light" );
}
std::string url = "#" + name;
il->setUrl( url.c_str() );
if ( lib_lights == NULL )
{
lib_lights = daeSafeCast< domLibrary_lights >( dom->add( COLLADA_ELEMENT_LIBRARY_LIGHTS ) );
}
domLight *light = daeSafeCast< domLight >( lib_lights->add( COLLADA_ELEMENT_LIGHT ) );
light->setId( name.c_str() );
osg::Light* pOsgLight = node.getLight();
domLight *pDomLight = daeSafeCast< domLight >( lib_lights->add( COLLADA_ELEMENT_LIGHT ) );
pDomLight->setId( name.c_str() );
domLight::domTechnique_common *domTechniqueCommon = daeSafeCast<domLight::domTechnique_common>(pDomLight->add(COLLADA_ELEMENT_TECHNIQUE_COMMON));
osg::Vec4 position = pOsgLight->getPosition();
osg::Vec3 direction = pOsgLight->getDirection();
osg::Vec4 ambientColor = pOsgLight->getAmbient();
osg::Vec4 diffuseColor = pOsgLight->getDiffuse();
osg::Vec4 specularColor = pOsgLight->getSpecular();
if (position.w() == 0)
{
// Directional light
domLight::domTechnique_common::domDirectional *domDirectional = daeSafeCast<domLight::domTechnique_common::domDirectional>(domTechniqueCommon->add(COLLADA_ELEMENT_DIRECTIONAL));
if ((position.x() != 0) || (position.y() != 0) || (position.z() != 0))
{
osg::Vec3 dir(-position.x(), -position.y(), -position.z());
// TODO wrap instance_light in a rotating node to translate default light [0,0,-1] into proper direction
}
domFloat3 color;
color.append3(diffuseColor.r(), diffuseColor.g(), diffuseColor.b());
domDirectional->add(COLLADA_ELEMENT_COLOR);
domDirectional->getColor()->setValue(color);
}
else if (direction.length() == 0)
{
// Omni/point light
domLight::domTechnique_common::domPoint *domPoint = daeSafeCast<domLight::domTechnique_common::domPoint>(domTechniqueCommon->add(COLLADA_ELEMENT_POINT));
domPoint->add(COLLADA_ELEMENT_CONSTANT_ATTENUATION);
domPoint->getConstant_attenuation()->setValue(pOsgLight->getConstantAttenuation());
domPoint->add(COLLADA_ELEMENT_LINEAR_ATTENUATION);
domPoint->getLinear_attenuation()->setValue(pOsgLight->getLinearAttenuation());
domPoint->add(COLLADA_ELEMENT_QUADRATIC_ATTENUATION);
domPoint->getQuadratic_attenuation()->setValue(pOsgLight->getQuadraticAttenuation());
if ((position.x() != 0) || (position.y() != 0) || (position.z() != 0))
{
// TODO wrap instance_light in a transforming node to translate default light [0,0,0] into proper position
}
domFloat3 color;
color.append3(diffuseColor.r(), diffuseColor.g(), diffuseColor.b());
domPoint->add(COLLADA_ELEMENT_COLOR);
domPoint->getColor()->setValue(color);
}
else
{
// Spot light
domLight::domTechnique_common::domSpot *domSpot = daeSafeCast<domLight::domTechnique_common::domSpot>(domTechniqueCommon->add(COLLADA_ELEMENT_SPOT));
domSpot->add(COLLADA_ELEMENT_CONSTANT_ATTENUATION);
domSpot->getConstant_attenuation()->setValue(pOsgLight->getConstantAttenuation());
domSpot->add(COLLADA_ELEMENT_LINEAR_ATTENUATION);
domSpot->getLinear_attenuation()->setValue(pOsgLight->getLinearAttenuation());
domSpot->add(COLLADA_ELEMENT_QUADRATIC_ATTENUATION);
domSpot->getQuadratic_attenuation()->setValue(pOsgLight->getQuadraticAttenuation());
if ((position.x() != 0) || (position.y() != 0) || (position.z() != 0))
{
// TODO wrap instance_light in a transforming node to translate default light [0,0,0] into proper position
// and rotate default direction [0,0,-1] into proper dir
}
domFloat3 color;
color.append3(diffuseColor.r(), diffuseColor.g(), diffuseColor.b());
domSpot->add(COLLADA_ELEMENT_COLOR);
domSpot->getColor()->setValue(color);
domSpot->add(COLLADA_ELEMENT_FALLOFF_ANGLE);
domSpot->getFalloff_angle()->setValue(pOsgLight->getSpotCutoff());
domSpot->add(COLLADA_ELEMENT_FALLOFF_EXPONENT);
domSpot->getFalloff_exponent()->setValue(pOsgLight->getSpotExponent());
}
// Write ambient as a separate Collada <ambient> light
if ((ambientColor.r() != 0) || (ambientColor.g() != 0) || (ambientColor.b() != 0))
{
domInstance_light *ambientDomInstanceLight = daeSafeCast< domInstance_light >(currentNode->add( COLLADA_ELEMENT_INSTANCE_LIGHT ));
std::string name = node.getName();
if (name.empty())
{
name = uniquify( "light-ambient" );
}
else
{
name += "-ambient";
}
std::string url = "#" + name;
ambientDomInstanceLight->setUrl( url.c_str() );
domLight *ambientDomLight = daeSafeCast< domLight >( lib_lights->add( COLLADA_ELEMENT_LIGHT ) );
ambientDomLight->setId(name.c_str());
domLight::domTechnique_common *ambientDomTechniqueCommon = daeSafeCast<domLight::domTechnique_common>(ambientDomLight->add(COLLADA_ELEMENT_TECHNIQUE_COMMON));
// Ambient light
domLight::domTechnique_common::domAmbient *domAmbient = daeSafeCast<domLight::domTechnique_common::domAmbient>(ambientDomTechniqueCommon->add(COLLADA_ELEMENT_AMBIENT));
domFloat3 color;
color.append3(ambientColor.r(), ambientColor.g(), ambientColor.b());
domAmbient->add(COLLADA_ELEMENT_COLOR);
domAmbient->getColor()->setValue(color);
}
traverse( node );
}